Avenge Me
From Halopedia, the Halo wiki
Avenge Me is a Bungie.net multiplayer medal available in Halo: Reach. It is earned by being avenged by a teammate. It is represented by a skull with a red cross on its forehead, on top of an eight-pointed blue-and-gold star. This medal will not show up on post-game carnage stats in the game, and can only be viewed on Bungie.net.[1]
On March 31, 2012 Bungie.net ceased updating Halo game stats and player records, transferring all record-keeping responsibilities to Halo Waypoint.[2] As Avenge Me could only be viewed on the site, it is effectively no longer awarded.